Cvs Create Patch
To create a patch from a CVS project: Select the resource that contains the modifications to be included in the patch.
Reference manual for CVS commands This describes every subcommand of CVS in detail, if you had to create a patch to the 1.2 version of the product.
This will create a subdirectory named. /gnuplot, and copy the cvs source tree into it. csh version setenv CVS_RSH patched patch -p1. ./patch1.patch.
Anonymous - read only access: cvs -d :pserver:pseudo_username cvshost.domain:/usr/src/cvsroot login
give it the password given above. cvs -d :pserver:pseudo_username cvshost.domain:/usr/src/cvsroot checkout project_name
The purpose of anonymous access is for users to get the most recent sources, but read-only. They can make changes, but can only generate a patch file, which should be sent to one of the developers. local - read or write access - for active developers.
The user has an account on the CVS host, and they should be listed in the cvsgrp, and they can set setenv CVSROOT /usr/src/cvsroot
However, CVS_RSH does not need to be set. See the example. cvsrc file below. remote - read or write access - for active developers.
The user should have an account on the CVS host, and they should be listed in the cvsgrp. It is possible to allow anonymous-like access, but it will not be described here, since the password is sent as clear text, and it s not secure at all.
Further discussions will assume that the SSH daemon is working on the CVS host, and that client-side SSH is there for the remote user. The user needs to define the following environment variables, which are necessary, and a couple of helpful C-shell aliases. The definitions are placed in the HOME/.cvsrc file, which is serving double duty. The lines following the shell exit tells CVS what default flags to use for the given CVS command. begin .cvsrc
setenv CVSROOT username cvshost.domain:/usr/src/cvsroot
alias cvsstat cvs status . grep Status:
alias cvswhat cvs status . grep Status: grep -v to-date
exit
default CVS options
diff -u
cvs -z4
update -d -P
checkout -P
Source this file to set the environment variables or aliases with C-shell source HOME/.cvsrc.
Cvs tag tag_name then this set of You can create a patch file of changes with cvs rdiff -u -r tag_name-r initial prj_name You can also create patch files.
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HOWTO - Use CVS
How to create a patch; How to create Creating a patch if you re using Git for version control is similar to CVS, which will create the patch in the current.
Creating patches using CVS
Two days ago I introduced patch files. Let s see how to generate them when the sources you are modifying are controlled by a version management system: CVS. Note that others also have this feature; just read their documentation.
Recalling the previous post, the common procedure to modify a source file, to later generate a patch, is to keep a backup of the original, like in: cp file.c file.c.orig
vi file.c
edit, edit, edit
diff -u file.c.orig file.c patch.diff
This is acceptable if all you modify is a single file, but gets complicated when you have to patch many of them. Furthermore it may lead to outdated patches which don t apply correctly to the latest version of the program.
But if the sources you are modifying are controlled by CVS, things change completely. First of all, you don t have to save a copy of the original code, as it s already stored in the repository. That is, you can proceed to modify all the files you wish locally. So, how to generate the patch. All you have to do is run cvs diff -u from within the source directory. This will create a patch that includes the differences for all the files you ve modified. The command accepts multiple optional arguments, which are the list of files or directories to be diffed diffing the whole tree can be sloooow.
Once you do this, you ll note that the output generated by the command is slightly different from what I explained in the previous post in fact, the header is bigger. Let s analyze a sample header: Index: sys/arch/i386/conf/GENERIC
RCS file: /cvsroot/src/sys/arch/i386/conf/GENERIC,v
retrieving revision 1.623
diff -u -r1.623 GENERIC
--- sys/arch/i386/conf/GENERIC 19 Jul 2004 :59 -0000 1.623
sys/arch/i386/conf/GENERIC 23 Jul 2004 :16 -0000
The first line shows which local file is beeing diffed matches the name in the --- line. The second, third and fourth lines give infomation about the file beeing retrieved from the CVS repository; in this case we can see that it picked up version 1.623 of the /cvsroot/src/sys/arch/i386/conf/GENERIC,v file, and that the diff command was called with the -u flag. The last two lines are as in regular patches. This information is there for the reader; the patch 1 utility will never use it.
Also note that generating patches from CVS if available gives a better impression to the person who has to review and apply the patch, so please use this feature.
For a complete example, check out this patch which I m quite proud of ;- against the NetBSD repository.
